There are no changes required at the node level to support request level cluster as index-search is stateless. You should configure request level clustering for Address search nodes. However, you need to update the configuration with the URL for the Address search cluster so that Admin console and Analyst nodes use the cluster for address search. Follow the instructions specified below:
The Single Line Address /index-search Service URL and WSDL
indexsearch.singleLineSearch.url=http://loadbalancer.example.com:<port>/index-search/SingleLineAddressService
indexsearch.singleLineSearch.wsdl= http://loadbalancer.example.com:<port>/index-search/
SingleLineAddressService?wsdl